A useful accessory that converts a drill driver into a depth sensitive, fully adjustable screwdriver, as it will insert the screw to a pre-set depth regardless of material hardness. Also suitable for drywall screws. A magnetic ring secures the screw onto the bit. This adjustable bit holder gives you accurate depth control for consistent and neat countersinking. A locking ring ensures that once set your chosen setting will not change accidentally. The universal shank is compatible with all makes of tools including Festool's Centrotec.